Thursday, September 09, 2010

The investment includes the following elements:

Ostroga Pilotowa

According to the navigational expertise developed by the Port of Gdynia Authority S.A. it is essential for the safety of the larger vessels traffic to broaden the inner entrance to the port at the bottom through the elimination of existing slopes. It is not possible without rebuilding the structure of the Ostroga Pilotowa (Pilot Groyne).

The scope of works

Underwater part: broadening of the inner entrance in the bottom by 14 m to the depth elevation of -13.5 m; supporting of the reinforced case of the groin's head placed on a 3-meter breakstone bed with the use of the steel sheet pile wall; the sheet pile wall sunk in the pit, then buried to the elevation of -9.2 m, covered with underwater concrete layer to the elevation of -8.4 m; punching 6 micropiles in protective tubes of 600kN load capacity to ensure the stability; reinforcing of the bottom around the structure of the groin’s converted head in the form of bound to each other polypropylene geotextile sandbags (277 pcs.) dimensions 2.0 x1.5x0.5 m placed on geotextile fixed to the bottom with pins - total area of 860 m2, geotextile edges covered with all-in aggregate or shingle gravel; cubic measure of dredging works max. 214 m3, backfilling with sand;

Above water part: crown elevation +2.3m;reinforced concrete superstructure in the form of a pile caps in the sheet pile wall joint with ribs, placed in reinforced concrete shuttering plates situated over the ribs of the existing structure, the space between the pile cap and existing structure filled with reinforced concrete slab, the head surface made of the vibro-pressed concrete sett (8 cm) on the foundation made of cement-sand sub-crust and the base of lean cement concrete, surface falling gradient of 0.5% to the outside from the axis; superstructure equipment: 6 rubber fender beams on each side and articulated fender beams on the front, two hatch ladders, two cast iron mooring bollards ZI-22,5, crash barrier made of steel pipes, four PVC culverts and cable vault for electrical installations; reconstruction of the navigation lights removed for the time of construction.

Port Channel – dredging works

Stages of the dredging works (planned depth -13.5 m):

Stage I: Outer harbor, Turn-basin No.1 of 500 m in diameter, Basin III; designed volume 687 206 m3, designed dredging area 539 740 m2;

Stage II: Port Channel from Turn-basin No. 1 to Turn-basin No. 2; designed volume 94 297 m3, designed dredging area 118 963 m2;

Stage III: Turn-basin No. 2 of diameter of 385 m; designed volume 57 332 m3, designed dredging area 132 663 m2;

Stage IV: Port Channel from Turn-basin No. 2 to Turn-basin No. 3; designed volume 219 243 m3, designed dredging area 195 073 m2;

Stage V: Turn-basin No. 3 of diameter of 400 m; designed volume 160 519 m3, designed dredging area 139 436 m2;

Stage VI: Port Channel from Turn-basin No. 3 to the Helskie I Quay; designed volume437 812 m3, designed dredging area 180 858 m2;

The total planned dredging volume 1 656 409 m3, area of 1 306 733 m2.

Reinforcing of the bottom

The designed reinforcement consists in placing a single layer of technical geotextile on the previously profiled bottom and then placing a layer of geotextile fabric bags filled with sand. Geotextile layer placed with the overlap and fixed to the bottom with the round bar pins, fixing in rows made every 2 m, 1.4 m distance between pins in a row, every 1 m on the edge; geotextile placed on the sheet pile wall or the wall of the box at the height of 50 cm and 50 cm on the outside of the reinforcement. Bags of dimensions 2.0 x1.5x0.45 m placed closely, bound with ropes threaded through special galvanized holes. Spaces inside the cavities of rolled sections of the sheet pile wall filled with a concrete plugs.

The extent of the bottom reinforcing:

The Dutch Quay - reinforcement broadening (100 m long) and new reinforcement (399 m long) in zone up to 21 m, at elevation of -13.5 m;

The Belgium Quay - reinforcement broadening (134 m long) in zone up to 21 m, at elevation of -10 m;

The French Quay - reinforcement broadening ( 316 m long), at elevation of -13.5 m and new reinforcement (196 m long) at elevation of -12.0 m, in zone up to 21 m;

The Norwegian Quay – preservation of the foot of a box with 7.2 m wide flange at the elevation of -9.2 m, and then slope down to the bottom in a 6.1 m wide zone at elevation of -11.0 m (256 m long) and preservation of corners of Indian and United States Quays;

The Slovak Quay (formerly Yugoslavian) – reinforcement of the bottom along with protective covering of footing of boxes at the elevation of -8.7 m, slope descent to the elevation of -9.7 m and further to the depth of -10.2 m (172 m long) and reinforcement of corners of Hungarian and Romanian Quays;

The Helskie I Quay – reinforcement of the bottom in zone up to 21 m, at the elevation of -12.5 m at length of 398 m and at the elevation of -13.2 m at length of 400 m; within area of "A" slipway (49.5 m long) reinforcement of area up to width of 30 m at the length of 21 m.

Total bottom reinforcement (broadening and extension) along the above quays will be ca. 47 thousand m2.